Fangrui Product Details Switch Between Transmitter And Receiver Modes With The Simple Flick Of A Switch Connect The Product To A Device Such As A Tv With A 3.5 Audio Cable/ Audio Cable. Wirelessly Streams Audio From Your Bluetooth-enabled Phone, Tablet, Or Computer To Your Wired Stereo, Speakers, Or Headphones Technologies: Bt5.0, A2dp, Avrcp (receiver Mode Only) Operation Range: Up To 10m / 33ft (without Any Blocking Objects) Charging Time: 2 Hours Continuous Use Time: 6 Hours (receiver Mode) / 5 Hours (transmitter Mode) Dimensions: 44 X 44 X 12mm (the Product Appearance And Printed Words Depending On The Batch, But This Does Not Affect Use) Color: As Shown Material: Abs Package Contents: 1 X Audio Receiver Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.